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    <script>
       // 2：有已知以下某公司员工薪金信息，把每一位员工的salary薪金信息 加 2000，并返回新数组，注意：不影响原数组
let persons = [
    {
        username:'张飞',
        sex:'男',
        salary:50000 
    },
    {
        username:'关羽',
        sex:'男',
        salary:60000
    }
]

    let newPerson=persons.map(function( value,index){
        return {
            ...value,
            salary : value . salary + 2000
        }
    })
    console.log(newPerson);
    console.log(persons);
    




    </script>
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